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First Indication of a PPU Case Head Separation

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britrifles View Drop Down
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    Posted: June 12 2022 at 8:15am
I have my first indication of an incipient case head separation in my first batch of PPU cases.

Unfortunately I have not logged the number of reloads, I suspect 30+, perhaps over 40.  Had to get the lighting just right for it to show in the photo below.   It does not look nearly this obvious in normal lighting. 

This was on the first firing after a partial length resize (I think I’ve P/L resized these cases three times now, typically get 10 to 15 neck sizing reloads between each P/L resize).  I shot this on Friday at the D-Day match.  I like to have the cases P/L sized for a major match, as it makes bolt cycling and lockup very fast for the rapid fire stage. 

I’ve been tracking the number of reloads in subsequent batches and now at 15 neck sizings and one partial length resize.  


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Shamu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: June 12 2022 at 12:13pm
Yep that's the classic symptom!

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: June 12 2022 at 1:39pm
That area of the case just forward of the head undergoes a lot of plastic strain, and thins the brass.  I can see it getting thin looking down the case mouth, the thin area will be in shadow if you shine a light down into the case.  Hate to junk this whole batch, but that’s probably what I should do. 




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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: June 12 2022 at 1:54pm
Might just be a weak one in the batch but probably binning the rest of that batch is the way to go.
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